Reciprocating steam-engine.



- L s. H. SCHMIDT.

REOIPROGATING STEAM ENGINE. APPLIUATION FILED JAIL 14, 1904 NO MODEL.

7 I 15 j A 6 i 7 (xi? J I 3 5 326665; H V

PATENTED MAY 2 if1904.

fiz alzr ald]; (fizz/ma;

UNITED STATES Patented May 24, 1904.

SIGURD H. SCHMIDT, OF MATAWAN, NEW JERSEY.

; RECIPROCATING STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 760,809, dated May 24,1904.

Application filed January 14,1904:- Serial No. 189,051. (No model.)

To all whom it may concern; 7

Be it known that I,'SIGURD H. SCHMIDT, a citizen of the United States,resid ing' at Matawan,

'in the county of Monmouth and State of New Jersey, have invented newand useful Improvements in Reciprocating Steam-Engines, of

which the following isa specification.

r This invention relates "to reciprocatingject to provide an improvedconstruction and arrangement of said parts by means of which anefficient and economical application of the steam to the work to be doneis accomplished. The parts are few in number and comprised in arelatively small space and compact manner, and waste and loss of steamis prevented.

To these ends my in'ventionconsis'ts in the features and in theconstruction, arrangement, and combination of parts hereinafterdescribed, and particularly pointed out in the claims following thedescription, reference being had to the accompanying drawings, form:

groove 1. Seated in said groove isa ring 5, split diagonally, as at 6,after the well-known manner of a metallic packing-ring, whereby saidring will have a tendency to expand and make a tight joint betweenitself, the piston, and the interior of the cylinder. said ring is ofless width than the groove 4,

. and owing to its expansibility it hugsthe interior of the cylinderscloser in frictional contact than the piston itself. Thusthe ring willonly move with the piston when one of the shoulders of the grooveengages a corresponding end of edge ofthe ring. The said ringconstitutes a valve which operates in the manner which will hereinafterbe explained.

As shown,

Formed in the enlargement 2 are two approximately semi-annular ducts orchannels 7 and 8, which are separatedat their adjacent ends by solidportions 9 of the cylinder. Communicating with the channel '7 is asteaminlet 10 and communicating with .the channel .8 is anexhaust-outlet 11. Formed in thatportion of the periphery of the cylinder'which is surrounded by the annular enlargement2 are four ports,respectively numbered 12, 13, 14,

and 15, the ports 12 and 13 constituting steaminlet ports and the ports14 and 15 exhaustports. Formed inthe piston 3 are two diagonal ports,respectively numbered 16 and 17 a which at their outer ends communicatewith the opposite end portions of the groove 4 in the piston and attheir inner ends respectively open into the ends A and B of the cylinderon either side of the piston. The ports respec* tively numbered18 and 19communicate with the oppositeend portions of the groove 1 on the lowerside of the piston. Attached to the periphery of the grooved portion ofthe piston by screws or other suitable fastenings are four ribs 20,which are arranged between the steam and exhaust ports and are seated ingrooves 21, formed in theinner side of the Ting-valve 5, the arrangementbeing such that the valve is movable on said ribs, while at Theoperation of my invention is as follows:

"Let it be assumed that the parts are in the position shown in Fig. 2 ofthe drawings and "that the piston is about to move to the right onits'rebound strokethat is to say, toward the end B of the cylinder.Thesteam will be fadmittedat the inlet 10 to the duct 7 and will passthrough the ports 13 and 16 to theend' A of the cylinder, and thepiston'willthus' be moved to the right by the impact and head of thesteam. At the same time the exhauststeam on the right-hand side of thepiston will escape-by the exhaust-ports 18 and 14 and duct 8 through theexhaust-outlet 11. The piston will now move forward to the right, thevalve 5, owing to its frictional contact with the interior of thecylinder, remain ing stationary until the shoulder 21 of the pistonengages the adjacent end of the valve. The valve will now move forwardwith the piston and will close the inlet-port 12 and the exhaust-port14, the greater portion of the exhaust-steam having by this time beenexhausted from the compartment B of the cylinder. The piston will nowcontinue to be impelled forward toward the right by the expansion of thesteam in the compartment A of the cylinder until it reaches or nearlyreaches the right-hand end of the cylinder. When it has reached saidend, the piston will rebound slightly, thus opening the port 13 andexhaust-port 15, whereupon the steam will be admitted to the end B ofthe cylinder through the duct 7 and steam-ports 13 and 17 and will beexhausted from the end A of the cylinder through the exhaust-ports 15and 19, when the action will be the same as that before described.

, From the foregoing it will be seen that the steam is cut off beforethe piston reaches the end of its stroke, and the steam will thencontinue to operate upon the piston by expansion, this occuring when thepiston has moved a distance equal to the difference between thehaust-ports, of a piston grooved on its periphery, steam and exhaustports in the piston adapted to register with the corresponding ports inthe cylinder, and an annular valve of less width than said groove andmovably seated in the latter for controlling said ports, substantiallyas described.

2. In a steam-engine, the combination with a cylinder providedintermediate its ends on opposite sides with two steam-ports and twoexhaust-ports, of'a piston grooved on its periphery, steam andexhaust'ports in the piston adapted to register with the correspondingports in the cylinder, an expansible annular valve of less width thanthe groove and movably seated in the latter for controlling said ports,said valve fitting the cylinder with tighter frictional contact than thepiston, substantially as described.

3. In a steam-engine the combination with a cylinder providedintermediate its ends on opposite sides with two steam-ports and twoexhaust-ports, of a piston grooved on its periphery, steam and exhaustports in the piston adapted to register with the corresponding ports inthe cylinder, and an annular valve of less width than the groove andmovably seated in the latter for controlling said ports, said valvebeing constructed to fit the cylinder with greaterfrictional contactthan the piston, substantially as described.

4:. In asteam-engine, the combination with a cylinder providedintermediate its ends on opposite sides with two steam-ports and twoexhaust-ports, of a piston grooved peripherally intermediate its ends,said piston being provided with two diagonal steam-ports adapted torespectively register with the steam-ports in the cylinder and leadingthrough the opposite ends'of the piston, two exhaust-ports in the pistonadapted to alternately registerwith the exhaust-ports in the cylinder,and an expansible annular valve of less width than the groove and seatedin thelatter for controlling said ports, substantially as described.

5. In a steam-engine, the combination with a cylinder providedintermediate its ends on opposite sides with two steam-ports and twoexhaust-ports, of a piston grooved peripherally intermediate its ends,said piston being provided with two diagonal steam-ports adapted torespectively registerwith the steam-ports in the cylinder and leadingthrough the opposite ends of the piston, two exhaust-ports in the pistonadapted to register with the exhaustports in the cylinder, an expansibleannular valve of less width than the groove and seated in the latter forcontrolling said ports, and longitudinal ribs on the grooved peripheryof the piston and movably seated in corresponding grooves in theinterior of the annular valve, substantially as described.

6. In a steam-engine, the combination with a cylinder providedexteriorly intermediate its ends with a circumferential enlargementhaving formed therein on its opposite sides two approximatelysemicircular ducts, two steamports in the cylinder communicatingwith'one of said ducts, two exhaust-ports in the cylinder communicatingwith the other of said duets, a steam-inlet and exhaust-outlet connectedrespectively with said ducts, a piston grooved circumferentially betweenits ends, two oppositely-inclined ports extending from the ends of saidgroove to the opposite ends of the piston, two exhaust-ports in thepiston leading from the opposite ends of the piston and adapted tocommunicate with the exhaustports in the cylinder, and an expansibleannular valve of less width than the said groove and seated in thelatter for controlling the ports, substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

SIGURD H. SCHMIDT.

Witnesses:

KARL VVA'ruIAsu, THOGR R. ESKESEN.

